FirefoxOS is an extremely important project, right up there with the browser at the time it was conceived.
As for the OS itself, years ago, there really wasn't much to say. It's improved dramatically since those early releases on low-end hardware. Check out some of the 2.5 demos. It's really something. What will really amaze you, of course, are the customization features you'll likely never find on other platforms.
As this is about the Matchstick, and you seem to like scathing reviews, take a look at this FXOS vs Android head-to-head in the smart TV arena. Needless to say, I was looking forward to the Matchstick.
When we look at the big picture, it is not positive at all!
I know. Google's spyware, Apples walled garden, it's a nightmare! That's why FXOS is so important. The mobile space needs an open platform and, most importantly, an open app package standard that anyone can implement. Users benefit by being able to keep their apps even when switching platforms and new platforms benefit from a wealth of apps ready to go from day one.
When you have a really good thing, you don't "cut your losses" simply because some kickstarter project didn't want to see another delay. It's not like the backers were consulted. I'd have voted to wait an extra year, if necessary, to get my hands on the thing. After all, I funded the project to support FXOS, not because I was interested in the matchstick. I know how important it is, and what it can do for mobile.